c# - 如何在 MVC View 中显示外键值

Question

我正在尽力获得一个简单的 MVC 应用程序来显示外键值，但我就是无法让它工作。

这是我的类(class):

public partial class Kingdoms
{
    public Kingdoms()
    {
        this.Provinces = new HashSet<Provinces>();
    }

    [Key]
    public int KingdomID { get; set; }
    public string Kingdom { get; set; }
    public Nullable<int> KingdomNr { get; set; }
    public Nullable<int> IslandNr { get; set; }
    public Nullable<System.DateTime> Created { get; set; }
    public Nullable<System.DateTime> Modified { get; set; }
    public bool AtWar { get; set; }
    public string Stance { get; set; }

    public virtual ICollection<Provinces> Provinces { get; set; }
}

public partial class Provinces
{
    public Provinces()
    {
        this.ProvinceData = new HashSet<ProvinceData>();
    }

    [Key]
    public int ProvinceID { get; set; }
    public int KingdomID { get; set; }
    public string Province { get; set; }
    public string Race { get; set; }
    public Nullable<int> Land { get; set; }
    public Nullable<int> Networth { get; set; }
    public Nullable<System.DateTime> Created { get; set; }
    public Nullable<System.DateTime> Modified { get; set; }

    public virtual Kingdoms Kingdoms { get; set; }
    public virtual ICollection<ProvinceData> ProvinceData { get; set; }
}

这是在我的 Controller 中:

public ActionResult SearchIndex(int networthfrom = 0, int networthto = 0, int landfrom = 0, int landto = 0, int nwafrom = 0, int nwato = 0)
    {
        var provinces = from p in db.Provinces select p;
        return View(provinces);
    }

现在，我不得不说我正在使用 Visual Studio 2012 中此 ActionResult 中的“添加 View ”选项。默认 View (SearchIndex.cshtml) 将显示:

@Html.DisplayFor(modelItem => item.KingdomID)

这将显示王国的 ID。但我想显示 Kingdoms 类中的字符串值 Kingdom。我尝试过以下方法:

@Html.DisplayFor(modelItem => item.Kingdoms.Kingdom)

但这只会生成:错误。处理您的请求时发生错误。

我正在将此应用程序发布到 Azure，仅供引用。

Answer 1

重写您的操作:

public ActionResult SearchIndex(int networthfrom = 0, int networthto = 0, int landfrom = 0, int landto = 0, int nwafrom = 0, int nwato = 0)
    {
        var provinces = db.Provinces.Include(p=>p.Kingdoms);
        return View(provinces);
    }

并使用 在 View 中

@Html.DisplayFor(modelItem => item.Kingdoms.Kingdom)